diff --git a/config/configuration.go b/config/configuration.go
index 1073f45..f72ce84 100644
--- a/config/configuration.go
+++ b/config/configuration.go
@@ -106,9 +106,13 @@ func (c *Configuration) FilterLogEventsInput() *cloudwatchlogs.FilterLogEventsIn
 }
 
 func (c *Configuration) TopStreamNames() []*string {
-	// FilerLogEvents can only take 100 streams so lets sort by LastEventTimestamp
+	// FilterLogEvents can only take 100 streams so lets sort by LastEventTimestamp
 	// (descending) and take only the names of the most recent 100.
 	sort.Slice(c.Streams, func(i int, j int) bool {
+		if c.Streams[i].LastEventTimestamp == nil || c.Streams[j].LastEventTimestamp == nil {
+			return false
+		}
+
 		return *c.Streams[i].LastEventTimestamp > *c.Streams[j].LastEventTimestamp
 	})
 
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..397ce0e
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,48 @@
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